Meine lieben polnischen Mitbürger … Warum nennen wir dieses Symbol „Affe“?

Małpa and nothing more.

IDK but my working theory is because of the perceived tail

If you use your imagination it looks like a monkey with a long tail. Not Polish but I can see that.

Because of long tail, I think

https://preview.redd.it/78gm7unnmqgg1.png?width=314&format=png&auto=webp&s=93ef4551bb58623bb56f56fce22417a5bdb1b073

No need to thank me for the technical sketch.

Well, in Spanish, it’s „monito“ (little monkey), and in Dutch: „apestaartje“ (little monkey tail).